Questions tagged [dc]

DC stands for Direct Current, which means the flow of electric charge in a single direction. Examples of a DC source are batteries, solar panels, dynamos.

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57 views

Battery powered ionic air pump voltage stepup

I am working on a proof-of-concept device for medical purposes, but am lacking in the electronics side of the skillset! I am trying to build a vibration-free wearable air pump, and using an ionic ...
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0answers
274 views

Using a “noise eating” active low-pass filter

I'm trying to use a MAX281 low-pass IC to filter a DC signal I'm producing on-board. I'm yet to find other chips with the same features so, if you haven't come across them, they're designed to work by ...
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1answer
71 views

Are large pulsed currents the most deadly type of electric shock?

As opposed to sustained electric shock via DC or AC? I might be wrong, but when people are killed by electrocution it is usually due to a large current of very short duration passing through their ...
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1answer
26 views

Co-application of DC field and Microwave Irradiation on Soil

I am attempting to design/enhance a system which applies direct current to a soil for the electro-kinetic remediation of organic/metal contamination. My current plan is to try enhancing conventional ...
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1answer
50 views

Increasing flash rate of xenon flasher

I've come into possession of a bunch of xenon flasher units of the type commonly mounted to burglar alarms and electric gates. I'm aiming to turn them into tiny strobes as part of a project I'm ...
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2answers
103 views

Controlling 12V 12A DC Pump using PIC

For part of my project for college I have co control a 12V DC pump which requires 12A. I was wondering what is the best solution for allowing the PIC to complete this as the output from the PIC is ...
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0answers
350 views

High voltage DC offset servo

I'm working on a project and I need some assistance. I have an audio tube amplifier output stage that I need to have adjustable operating points while maintaining a DC null at the output. [![enter ...
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2answers
68 views

Current flowing in an open circuit to make it the same voltage

I've tried to research this answer for quite some time but i'm struggling to find a proper answer. I think my question falls between antenna theory and batteries. So in a dipole antenna we supply a ...
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0answers
92 views

Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
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1answer
23 views

I want to handle the voltage and current spikes from inductive load of 220V AC ceiling fan

I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.
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56 views

What can I add to a DC circuit, to limit the voltage to 24V and current to 16 amps?

I have a battery pack that can put out around 25V and 20 amps, but it needs to be limited to 24V and 16 amps. Update: This is a follow-up to my question from yesterday: Protected 18650 batteries ...
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1answer
71 views

Limiting current draw from a power supply

I have a power supply that can supply around -60 kV DC and 10 mA. This power supply provides energy to a device known as a fusor. A fusor utilizes a low current and a high voltage to ionize a gas and ...
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33 views

Protecting Copper Anode in 12V DC System

Getting to grips with cathodic protection here. If someone had a 12, 24 or 48VDC system, say solar PV and batteries, and the battery negative is earthed, this means the earth is the cathode, and the ...
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3answers
144 views

Off grid LED solar lighting without batteries

I have 2 COB LEDs (12-14V DC, 50W, I think with 3,75 A in data sheet). I need to run them with a solar panel, it should only run when there is sunlight no batteries needed. Using a 270W panel (open ...
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0answers
28 views

How to calculate or show in matlab/pspice the DC component from a circuit simulation?

Based on Pspice I'm simulating this RL full wave rectifier That gives the next voltage and current output at the showed probe point The idea is to extract the DC component of the current or voltage, ...
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1answer
45 views

DC Gain too low at higher voltages

I am having an issue with DC gain for a non-inverting op amp circuit. All I am trying to do is double the voltage from two DAC outputs (DAC range is 0 to 5V and I want it to be ~0V to 10V). The DAC ...
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1answer
91 views

boost converter to high voltages (20kv+)

I am interested in making a mini, potentially portable ion thruster. The Question: Is it possible to create a boost converter that takes low voltage batteries ranging from 3.7V to 24V and boost that ...
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0answers
48 views

Isolated vs non-isolated boost converter for LED (12v to 24v)

I have a 12v system in my motorhome and planning on installing 24v LED strips, however, I'm unsure whether I would need an isolated or a non-isolated boost converter. I'll be using roughly 5 meters ...
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0answers
33 views

how to choose/design a capacitor value for surge current(for protection) for DC brush motor?

I am driving a DC BRUSH Motor at 30.V.D.C and the current is 300 Millie ampere, it is powered by L.M.317 I.C .My sir is suggesting to provide a capacitor as a protection form surge/peak current ...
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1answer
114 views

Connecting unbalanced parallel battery strings to a common DC bus

We are currently researching a system in the design phase which will use 2 parallel 48V lithium battery strings. Each string will have a battery management system ensuring the cells are balanced. ...
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1answer
112 views

Nest Protect gen 2 battery to POE

Hey all i am looking for some advice in how to go about my project with a Nest Protect gen 2. In my home i have ran cat6 wire to all 3 locations that require a smoke detector. These cat6 cables are ...
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0answers
150 views

Use of DC source in Zener clamping circuit

A question in my engineering degree asked me to design a clamp circuit that gives a 10V 50Hz AC signal a +5V DC bias. I designed the following circuit as my answer: I assumed 0.6V forward drop for ...
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1answer
59 views

12VAC Common Reference

Working on a design where power supply (on the PCB) is 12VAC to full wave rectifier to 5VDC linear regulator. Customer switch box is also power via same 12VAC source and will be switching that 12VAC ...
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3answers
316 views

Do EVs with a DC motor require an inverter and/or/nor a converter between the battery?

I'm somewhat familiar with Tesla's electric vehicles and that they use AC motors, but I'm completely unfamiliar with EVs that use DC motors. I know that in a Tesla an inverter is required to convert ...
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0answers
2k views

Need a choke coil inductor for DC welder

Working on making an AC 225 volt welder into an AC/DC welder (225 volt AC and 125 volt DC). I purchased bridge rectifier for 225 amp and 220 volts. I am going to use two 3500 uF capacitors and a ...
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1answer
138 views

Generate measurable reverse torque with DC motor as a dynamometer

I am trying to use a KBRG 225D regen drive as a dynamometer to apply reverse torque in order to stress my test engine? I am wondering if anyone has experience or guidance? I am not sure how to measure ...
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345 views

Inrush current in DC DC converter

I am in the process of learning about DC DC converters. What I am trying to figure out is whether inrush current is needed to maintain the input voltage at the DC-DC converter input while getting its ...
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0answers
247 views

How to synchronize current from an AC and DC current

I'm trying to make a battery less solar grid in which energy from the solar panel will be directly given to home appliances and will be complemented by current from the grid. I'm thinking of passing ...
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0answers
51 views

Does an HEV Genset need a controller?

I am part of a team at school that designs and builds a hybrid electric vehicle. We have chosen to use a series hybrid configuration, so we will be using a motor as a generator to charge lithium ...
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0answers
1k views

Using a Ryobi 36v battery to power an electric kart

I'm attempting to use a BPL3650 36v Ryobi battery as the power source for replica electric willy's jeeps I've constructed for my kids. The batteries charge fine in the standard chargers available off ...
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79 views

Current across high speed mechanical switch contact even if it can’t be measured?

If I am cycling a mechanical switch at a frequency higher than the bandwidth of a current amplifier and biased using a DC source, is current actually flowing across the contact? The following ...
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191 views

Circuit for voltage division and DC shift doesn't work

I've connected the circuit below on a breadboard and tested it in the lab: Components: \$R_{1}=1\,M\Omega,\;R_{2}=40\,k\Omega,\;R_{3}=R_{4}=R_{5}=R_{7}=R_{8}=20\,k\Omega,\;R_{6}=49.9\,k\Omega\...
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207 views

Raspberry pi B+ internal power supply ckt?

I have just started to study about raspberry pi B+ (data sheet) Can somebody explain the working of power supply circuit (individual component wise) starting from pg 14. How and why it is ...
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60 views

Is this motor suitable for my project?

i have a project which have 4 18volt DC motors, each motor rotate a screw which is 8mm and pitch 1.25mm and 200mm length vertically, load connected via nut in screw, every motor has 3.5 KG load and ...
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562 views

Reverse current frying a boost converter?

AFAIK, most boost converters incorporate a diode or some mechanism for ensuring that current flows from the battery to the output. For instance, TPS61030's datasheet says that This device however ...
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0answers
677 views

Application of Fourier Series in Circuit

I am trying to find \$v_o(t)\$ in the circuit below, where $$v_s(t) = 3 - \frac{6}{\pi}\sum_{n=1}^{\infty}\frac{1}{n}\sin2\pi n t$$ The correct answer is $$v_o(t) = \frac{3}{2} - \frac{3}{\pi}\sum_{n=...
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679 views

Stepper motor to replace brushed DC motor to be used to start a gas engine?

I'm trying to decide if it would be possible to use a stepper motor to replace a current 12V DC brushed motor that is used to turn over a small (~149cc) gas engine for starting. The reason why is, I ...
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0answers
2k views

DC current amplification

i'm trying to design a battery charger for 5Ah li-ion battery. Due to cost management problems, i am not able to use advanced 5A charger controller ICs; instead, i am going to use a 1A controller with ...
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4k views

Reversing the direction of rotation of a DC cooling fan

We usually connect a small DC cooling fan as show in the diagram. But is there any method to reverse the rotation of this fan in real time, by adding any external circuits?
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374 views

Maverick probe causes ardiuno to reset when touches grounded electrical item

I have a Maverick 732 probe connected to an Arduino for measuring temperature. The outer shield of the probe is connected to the ground pin on the Arduino, and the other wire is connected to an analog ...
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0answers
295 views

Control DC circuit with an AC lock switch

I am currently adding circuit with a horn and some lights powered by a motorcycle battery. The circuit should be using about 12v 18A. What I want to do is control the circuit with a lock switch. I've ...
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2answers
43 views

AC/DC Converters in Series with the Same AC Source

Would it be safe to connect two identical AC/DC converters in series if they share the same AC source? My concern is that the negative DC output is grounded somewhere in the converters causing the ...
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45 views

Protection Devices in DC ciruits

I am putting together a design for a custom Electrical panel. The panel consists of mainly DC powered components (Sensors, Controllers). Components are to be mechanically positioned using a DIN rail. ...
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1answer
32 views

Non contact AC voltage detector resistors

In this non-contact AC voltage detector, I understand the working principle of taking a tiny induced current in the antenna and amplifying it using transistors. However, I do not understand why the ...
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22 views

Combined 25V/OPEN and 25V/0V Input circuit

I am designing a board for digital inputs in which I will be receiving 2 types of inputs, 25VDC/OPEN and 25VDC/0V, 10 inputs each. The input signals have different specs but is it OK to design same ...
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1answer
59 views

Safe to use a common return for multiple DC power supplies?

I have four 12V DC power supplies powering four separate loads (12V LED light strips). Is it safe to use a common return path for all four loads? simulate this circuit – Schematic created using ...
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1answer
36 views

OK To Use This Male/Female Jack Combo For 24 Volt DC?

I'm using 24 volt DC motors along with 12 volt solenoid actuators for a installation piece. For ease of install and maintenance, I want to wire each motor with a barrel jack like the one below: ...
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1answer
89 views

Help me identify the adapter plug

Which type of connector is it? DC, 4 pins, a plug (cable side, not board side) with 4 female sockets. It resembles a Kycon 4-pin DC connector but reversed. It is taken from FSP's AC/DC adapters and ...
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59 views

How to adjust speed on a 12v DC gear motor (what motor do I need)

First off, I have no idea what I’m doing, treat me as though your trying to explain this to a child.. I want to take a DC motor, run a shaft (2-3ft) down to a pulley, then run a belt around that ...
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105 views

DC boost converter output voltage problem when load is connected

I have successfully finished one part of the DC converter. Now I came across a certain problem which I can't solve myself. When I didn't connect a load to the output of the dc converter, there was ...